package com.itheima.sh.filter;

import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author: 飞羽鸿蒙
 * @date: 2020/12/20 22:37
 */
@Component
@Order(-1) // int类型值,越小越优先
public class LoginFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        // 1.得到request对象
        ServerHttpRequest request = exchange.getRequest();

        ServerHttpResponse response = exchange.getResponse();

        // 2 得到前端传递 token 参数
        String token = request.getQueryParams().getFirst("token");
        // 2.1 没有token 或 token不为 admin 拦截
        if (StringUtils.isBlank(token) || !"admin".equals(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);  // 未授权

            return response.setComplete();
        }

        // 放行
        return chain.filter(exchange);
    }
}
